FAQ

No. Circuit breakers and overvoltage and undervoltage protectors provide different protections. Circuit breakers primarily interrupt short-circuit currents, tripping to protect equipment when a short-circuit occurs. Overvoltage and undervoltage protectors, on the other hand, operate when they detect system voltage anomalies (over- or under-voltage). While the two functions complement each other, they cannot replace each other.

Common single-phase overvoltage and undervoltage protectors are typically suitable for 220V AC voltage and 50Hz frequency, with rated operating currents of 40A and 63A.
The overvoltage trip value is typically around AC 270V, and the undervoltage trip value is around AC 170V. Parameters such as the recovery voltage and power-on delay after a power outage vary depending on the specific model and standard.

Most products have CE and 3C certifications. 
Different products have different certifications. 
Please contact us for specific information.

Resettable overvoltage and undervoltage protectors have a certain service life (for example, the electrical life is typically over 100,000 cycles). We recommend regular inspection and replacement based on usage to ensure reliability.

-Correct wiring: Be sure to distinguish between the input terminal (for power input) and the output terminal (for load output), and ensure that the neutral (N) and live (L) wires are connected correctly.
-Tighten screws: During installation, tighten the terminal screws with appropriate torque to avoid heat damage caused by poor contact.
-Environmental requirements: Do not use the product in humid, wet, or corrosive environments to prevent product damage or electric shock.

-Grid issues: The grid voltage itself is unstable, fluctuating significantly, or at a critical point in the protector's operating range; the neutral conductor may have poor contact.
-Product settings: The protector's overvoltage or undervoltage protection settings may be incorrect.
-Product failure: An internal component of the protector (such as the disconnect relay) may be faulty.

Suggestion: First, measure the voltage at the input to see if it's normal. If the voltage is normal, there may be a product issue and further inspection or contact after-sales service is necessary.

If you encounter a malfunction that cannot be resolved yourself, or if the product is severely damaged and malfunctions, please stop using it immediately and contact our professional after-sales service personnel for inspection and repair. Never disassemble or repair the product yourself, as this may cause safety hazards or further damage to the product.